Lower main grille



FIG. 1 is perspective view of the lower main grille showing the new design;

FIG. 2 is a side view, thereof; and,

FIG. 3 is a front view, thereof.

In the figures, features shown by broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an lower main grille, as shown and described. 